A lower pH value indicates a higher concentration of __ ____and a more _____ solution, whereas a higher pH value represents a _______concentration of ___ ____ and a more alkaline solution. Select the correct answers and in the correct order to complete the blanks.
H+ ions; acidic; lower; H+ ions
HCO3- ions; basic; higher; HCO3- ions
CO2 ions; acidic; lower; CO2 ions
H+ ions; lower; acidic; H+ions